Air feed mounting for rock drills



Feb. 21, 1933.

F. M. SLATER AIR FEED MOUNTING FOR ROCK DRILLS 2 Sheets-Sheet 1 Filed Dec. 10, 1951 v I N VN TOR.

2 Sheets-Sheet 2 INVENTOR. E't flalafea E115 ATTORNEY Feb. 21, 1933.

. F. M. SLATER AIR FEED MOUNTING FOR ROCK DRILLS Filed Dec. 10, 1931 Patented Feb. 21, 1933 UNITED STATES PATENT FFICE FRED M. SLATER, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COM- PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY AIR FEED MOUNTING FOR ROCK DRILLS Application filed December 10, 1931.

This invention relates to rock drilling mechanism, but more particularly to an a r feed mounting for rock drills of the fluid actuated type.

An object of the invention is to simpllfy the construction and therefore to reduce the cost of manufacturing and maintenance of devices of this character.

Other objects will be in part obvious and in part pointed out hereinafter.

In the accompanying drawings lllustrating the invention and in which similar reference characters refer to similar parts,

Figure 1 is a longitudinal side elevation of an air feed mounting constructed in accordance with the practice of the invention,

Figure 2 is a plan View of the mountlng, Figures 8, 4, 5 and 6 are transverse vlews taken through Figure 1 on the lines 3 3, H, 5-5 and 6-6, respectively, looking in the directions indicated by the arrows,

Figure 7 is a sectional plan view of the mounting,

Figures 8 and 9 are transverse views taken through Figure 7 on the lines 8-8 and 9-9 respectively looking in the directions indicated by the arrows, and

Figures 10 and 11 are transverse views taken through Figure 9 on the line 1010 l111 and looking in the directions inclicated by the arrows.

Referring more particularly to the drawings, the air feed mounting whichis designated, in general, by A. comprises a pair of heads B and C which are held in spaced relation with respect to each other by standards D and E threaded in this instance with one end into the head B.

The opposite ends of the standards D and E are of somewhat smaller diameter than the body portions of the standards and ex tend throu h the head C and through a cover F disposed onthe end of the head C. Nuts G are threaded on the proiecting ends of the 45 standards D and E to clamp the cover F securely against the head C and the head C against shoulders H on the standards D and'E.

In the head C is a bore J having an en- 50 larged portion K to receive an end of a feed- Serial No. 580,012.

ing cylinder L which extends with its 0pposite end into a bore 0 in the head B. The feeding cylinder L seats with one end against the bottom of the bore 0 and with its other end against a shoulder P at the inner end of the enlarged portion K.

Within the feeding cylinder L is a piston Q consisting in this instance of a pair of telescopically arranged members R and S having packing material T therebetween to assure against leakage along the piston. The members R and S are suitably bored to receive a reduced end U of a piston rod V. The end U of the piston rod projects rearwardly of the piston and is threaded to re 65 ceive nuts W whereby the members are clamped together to compress the packing material T and also to clamp the member R against a shoulder X at the juncture of the end U and the body portion of the rod V.

The front end of the rod V extends slidably through a bore Y in the head B and through a packing gland Z threaded into an enlarged portion 6 of the bore Y for compressing packing material 0 arranged in the 75 enlarged portion 6 for preventing leakage of pressure fluid from the feeding cylinder L.

The front or free end of the rod V is preferably tapered as at d to seat into a tapered bore 6 of a lug f carried by a saddle which is designated, in its entirety, by g.

The saddle comprises a bearing h of which the lug f may form an integral part and said bearing it is provided in its upper surface with a concave recess j to support a rock 85 drill 70- illustrated as being of the hand-held type and shown in dot and dash outline. A bearing cap 0 seats on the top of the rock drill in, and a pair of bolts p extend through the bearing cap and are threaded into the bearing h. Thebolts p are shown as being of the stud type and are accordingly provided with nuts 9 whereby an intermediate portion of the rock drill is may be securely clamped between the bearing h and the bearing cap 0.

The bearing h, moreover, acts as a support for one end of rods r disposed on the opposite sides of the bearing and the rear ends of which extend through the opposite sides of mo a cross head 8 disposed rearwardly of the rock drill is. The bolts 1" are threaded at their opposite ends for the reception of nuts 25 which seat against the front and rear surfaces of the bearing h and the cross head 8, respectively.

In order to support the rear end of the rock drill 7'; support members to are journalled on the rods 1 and have upwardly extending wings o to lie on opposite sides of a handle w of the rock drill is. The wings o are suitably apertured for the reception of a bolt 00 which also extends through the handle w and is provided with a nut y to clamp Callie wings o securely to the ends of the han- The cross head .9, which spans the feeding cylinder L, is supported by a rod or bolt .2 which is arranged in parallelism with the feeding cylinder and extends with its rear end through a cross head 2. A spacer 3 is disposed on the rod .2 to hold the cross heads 8 and 2 in spaced relation with respect to each other, and a nut 4 is threaded on the rear end of the rod 2 to clamp the cross heads and the spacer 3 securely in position.

The cross head 2, like the Cross head 8, spans the feeding cylinder L and in the ends thereof are apertures 5 to receive the standards D and E upon which the cross head 2 slides.

In the opposite sides of the head B are threaded recesses 6 and 7 for the reception of plugs 8 which'support connections 9 and 10. The connection 9 maybe that leading from a source of pressure fluid supply and, the connection 10 may, as illustrated in Figure 2, be connected to the rock drill 7.; by a hose or supply line 11 to supply pressure fluid to the rock drill. The bushings 8 are preferably identical so that the connections 9 and 10 may be interchanged at will, and in the present instance the recesses 6 and 7 are connected by a passage 12 which extends through the head B.

The distribution of pressure fluid to the opposite ends of the feeding cylinder L is controlled by a throttle valve 13 arranged in a valve chamber 14 in the head B. The throttle valve 13 is of the rotary type and carries a projection 15 to accommodate a lever 16 whereby said throttle valve may be manipulated.

Leading from the recess 7 to the end of the valve chamber 14 is a supply passage 17 and in the throttle valve 13 is a longitudinally extending passage 18 which is in constant communication with the supply passage 17 and has a lateral branch 19,

which, in one limiting position of the throttle valve, registers with a passage 20 and in another position with a passage 21.

The passage 21, which is located entirely iwithin the head B, opens into tae front end of the feeding cylinder L, and the passage 'anism away 20 extends through the standard D and communicates with the rear end of the feeding cylinder L or, more specifically, with the interior of the head C and the cover F through a lateral passage 22 located in the standard D and the head C.

In the periphery of the throttle valve 13 and in the same transverse plane as the branch passage 19 is a groove 23 to afford communication between an exhaust port 24 in the head B and either-of the passages 20 and 21.

In order to enable the mounting to be conveniently supported the head B is provided with a cone 25 of a oonventlonal type adapted to be clamped by suitable and well known mechanism to a support member, as for instance a column or quarry bar (not shown).

The operation of the devlce is as follows: Let it be assumed that the feeding piston Q and therefore the rock drill is are in the rearmost limiting positions and that it be desired to advance the rock drill in the d1rection of the work. The throttle valve 13 may then be rotated to the posltion illustrated in Figure 10 wherein the branch passage 19 registers with the passage 20. In th1s way pressure fluid will be admitted rearwardly of the piston Q, and will 'act thereagainst to drive the piston, together with the saddle 9, towards the work. Upon completlon of the drill hole the throttle valve 13 may be rotated to the position illustrated m Figure 11 and wherein the passage 19 registers with the passage 21. At the same time the groove 23 will establish communication between the passage 20 and the exhaust port 24. The pressure fluid will then be exhausted from the rear end of the cylinder L and pressure fluid will simultaneously be admitted into the front end of the cylinder to act against the piston Q, for drawing the drilling mechfrom the'work.

Likewise, pies a position to drive the dr1ll 1ng mechanism forwardly the groove 23 W11]. register with the passage 21 and the exhaust port 24 so that the front end of the feeding cylinder 5 L will be open to the atmosphere.

I claim:

1. An air feed mounting for rock drills, comprising a pair of heads, standards for holding the heads in rigid spaced relationship, afeeding cylinder supported by the heads, a piston in the cylinder having a rod extending through one head, a saddle affixed with one end to the rod and being slidable when the throttle valve 13 occuwith its other end on the standards, means.

for clamping a rock drill to the saddle, and means for supplying pressure fluid to the ends of the feeding cylinder.

2. An air feed mounting for rock drills,

comprising a pair of heads, standards for holding the heads in rigid spaced relationship, a feeding cylinder supported at its ends by the heads, a piston in the cylinder having a rod extending through one head, asaddle affixed at one end to the free end of the rod and being slidable With its other end on the standards, means for clamping a rock drill to the saddle, a valve chamber in one head, passages leading from the valve chamber to the ends of the piston chamber, and a throttle valve in the valve chamber to control the admission of pressure fluid into the passages and the exhaust of fluid therefrom.

3. An air feed mounting for rock drills, comprising a pair of heads, standards for holding the heads in rigid spaced relationship, a feeding cylinder supported at its ends by the heads, a piston in the feeding cylinder having a rod slidable in one head, a throttle valve chamber in one head, a passage in the heads and in one of the standards for conveying pressure fluid to one end of the feeding cylinder, a passage leading from the valve chamber to the other end of the cylinder, a throttle valve in the valve chamber to control the passages, and a saddle afiixed to the free end of the rod and being slidable with its other end on the standards, and means for clamping a rock drill to the saddle.

In testimony whereof I have signed this specification.

FRED M. SLATER. 

